Fix thinko in multi-autovac-workers code: validity checks made by GUC assign hooks are supposed to be made whether doit is true or not.
Fix thinko in multi-autovac-workers code: validity checks made by
GUC assign hooks are supposed to be made whether doit is true or not.

zaksoup/gpdb,greenplum-db/gpdb,janebeckman/gpdb,Chibin/gpdb,Chibin/gpdb,50wu/gpdb,cjcjameson/gpdb,yazun/postgres-xl,oberstet/postgres-xl,yuanzhao/gpdb,lisakowen/gpdb,ovr/postgres-xl,zaksoup/gpdb,techdragon/Postgres-XL,pavanvd/postgres-xl,adam8157/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,Quikling/gpdb,yazun/postgres-xl,janebeckman/gpdb,kmjungersen/PostgresXL,Chibin/gpdb,kaknikhil/gpdb,rvs/gpdb,xinzweb/gpdb,cjcjameson/gpdb,kmjungersen/PostgresXL,tpostgres-projects/tPostgres,yazun/postgres-xl,CraigHarris/gpdb,greenplum-db/gpdb,zaksoup/gpdb,xuegang/gpdb,greenplum-db/gpdb,tpostgres-projects/tPostgres,pavanvd/postgres-xl,yuanzhao/gpdb,chrishajas/gpdb,Chibin/gpdb,xinzweb/gpdb,ashwinstar/gpdb,chrishajas/gpdb,xuegang/gpdb,xuegang/gpdb,arcivanov/postgres-xl,zeroae/postgres-xl,kaknikhil/gpdb,kaknikhil/gpdb,lisakowen/gpdb,CraigHarris/gpdb,postmind-net/postgres-xl,royc1/gpdb,techdragon/Postgres-XL,arcivanov/postgres-xl,ahachete/gpdb,xuegang/gpdb,rvs/gpdb,pavanvd/postgres-xl,Quikling/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,ahachete/gpdb,kaknikhil/gpdb,0x0FFF/gpdb,ahachete/gpdb,rvs/gpdb,adam8157/gpdb,arcivanov/postgres-xl,lintzc/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,ovr/postgres-xl,tpostgres-projects/tPostgres,50wu/gpdb,rvs/gpdb,cjcjameson/gpdb,xuegang/gpdb,50wu/gpdb,jmcatamney/gpdb,lintzc/gpdb,lintzc/gpdb,xuegang/gpdb,0x0FFF/gpdb,kmjungersen/PostgresXL,rvs/gpdb,lintzc/gpdb,rvs/gpdb,jmcatamney/gpdb,50wu/gpdb,edespino/gpdb,postmind-net/postgres-xl,tpostgres-projects/tPostgres,kaknikhil/gpdb,adam8157/gpdb,rvs/gpdb,xuegang/gpdb,ashwinstar/gpdb,cjcjameson/gpdb,lintzc/gpdb,kmjungersen/PostgresXL,chrishajas/gpdb,0x0FFF/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,Postgres-XL/Postgres-XL,lintzc/gpdb,ahachete/gpdb,janebeckman/gpdb,zaksoup/gpdb,rvs/gpdb,oberstet/postgres-xl,ahachete/gpdb,Chibin/gpdb,Postgres-XL/Postgres-XL,snaga/postgres-xl,greenplum-db/gpdb,ashwinstar/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,yuanzhao/gpdb,50wu/gpdb,CraigHarris/gpdb,lisakowen/gpdb,ahachete/gpdb,xuegang/gpdb,edespino/gpdb,Postgres-XL/Postgres-XL,postmind-net/postgres-xl,Quikling/gpdb,royc1/gpdb,arcivanov/postgres-xl,50wu/gpdb,Chibin/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,xuegang/gpdb,janebeckman/gpdb,ovr/postgres-xl,lintzc/gpdb,postmind-net/postgres-xl,janebeckman/gpdb,xinzweb/gpdb,lisakowen/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,xinzweb/gpdb,lintzc/gpdb,chrishajas/gpdb,0x0FFF/gpdb,greenplum-db/gpdb,ahachete/gpdb,Quikling/gpdb,chrishajas/gpdb,edespino/gpdb,jmcatamney/gpdb,edespino/gpdb,50wu/gpdb,pavanvd/postgres-xl,yuanzhao/gpdb,oberstet/postgres-xl,Quikling/gpdb,janebeckman/gpdb,jmcatamney/gpdb,postmind-net/postgres-xl,xinzweb/gpdb,edespino/gpdb,Quikling/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,kaknikhil/gpdb,adam8157/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,zaksoup/gpdb,kaknikhil/gpdb,rvs/gpdb,Quikling/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,zaksoup/gpdb,0x0FFF/gpdb,zeroae/postgres-xl,cjcjameson/gpdb,yuanzhao/gpdb,0x0FFF/gpdb,rvs/gpdb,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,ashwinstar/gpdb,cjcjameson/gpdb,edespino/gpdb,adam8157/gpdb,chrishajas/gpdb,jmcatamney/gpdb,royc1/gpdb,royc1/gpdb,oberstet/postgres-xl,chrishajas/gpdb,zeroae/postgres-xl,ovr/postgres-xl,cjcjameson/gpdb,oberstet/postgres-xl,ahachete/gpdb,edespino/gpdb,zeroae/postgres-xl,techdragon/Postgres-XL,techdragon/Postgres-XL,edespino/gpdb,Chibin/gpdb,50wu/gpdb,xinzweb/gpdb,ovr/postgres-xl,lisakowen/gpdb,jmcatamney/gpdb,kmjungersen/PostgresXL,CraigHarris/gpdb,lisakowen/gpdb,royc1/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,snaga/postgres-xl,edespino/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,janebeckman/gpdb,yazun/postgres-xl,xinzweb/gpdb,Quikling/gpdb,0x0FFF/gpdb,jmcatamney/gpdb,edespino/gpdb,yazun/postgres-xl,zaksoup/gpdb,Chibin/gpdb,snaga/postgres-xl,Chibin/gpdb,Quikling/gpdb,janebeckman/gpdb,zaksoup/gpdb,royc1/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,snaga/postgres-xl,royc1/gpdb,snaga/postgres-xl,royc1/gpdb,chrishajas/gpdb,adam8157/gpdb,pavanvd/postgres-xl,janebeckman/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,lisakowen/gpdb,yuanzhao/gpdb,Chibin/gpdb,janebeckman/gpdb,CraigHarris/gpdb,adam8157/gpdb,Quikling/gpdb,lintzc/gpdb,CraigHarris/gpdb